Start by gathering all your ingredients. Chop bell peppers if using them. Shred the cheese if not already done. Keep everything ready near your cooking area. This makes the process smooth and quick.

Place a non-stick pan on medium heat. Add a small amount of oil or butter. Let it heat gently. A warm pan helps the tortilla cook evenly and become crispy.

Put one tortilla in the pan. Let it warm slightly for a few seconds. This step helps prevent soggy texture. It also makes it easier to spread toppings.

Spread a thin layer of pizza sauce on the tortilla. Do not add too much. Too much sauce can make the quesadilla soggy. Keep it light for best results.

Sprinkle mozzarella cheese over the sauce. Add pepperoni slices evenly. You can also add bell peppers and chili flakes. The cheese will melt and hold everything together.

Place another tortilla on top. Press it gently with a spatula. This helps the layers stick together. It also ensures even cooking.

Cook for 3 to 4 minutes on one side. Flip carefully using a spatula. Cook the other side until golden and crispy. The cheese inside should be fully melted.

Remove from the pan and place on a board. Let it cool slightly. Cut into wedges using a knife. Serve warm with extra pizza sauce or dip of your choice.